The overwhelming sense of not giving a crap about the horrendous amount of work and deadlines you have simply because it's Friday.
M1 - "Hey man, you wanna duck out early and go play some disc golf?"
M2 - "Don't you have a big report due on Monday?"
M1 - "Yeah, but I've got a case of the Friday Fuck-Its. I won't get anything done anyway."
When you have to take a dump but are too preoccupied with what you're doing to take a break until the resulting abdominal pain is too great to ignore. The result is this embarrassing slow, hunched-over shuffle to the bathroom. Commonly performed by friends when playing MMOs in large gaming gatherings or other similar situations.
1: "Dude, can you believe Mike's wicked winning streak in the Rumble Pit? It was 3 hours of brutality! Total God mode action."
2: "Yeah, he was glued to that screen and talkin smack, but he's paying for it now. You see him doin the truffle shuffle down the hall?"
1: "Ha ha. Powned by Mother Nature!"